Possible Duplicate:
WMD unable to render markup inside words
This is a simple bug: You can't make individual letters in a word bold.
Example:
**SVG** stands for **S**calable **V**ector **G**raphics
SVG stands for Scalable Vector Graphics
Dirty(?) Workaround:
I found a workaround that uses the Unicode character "Zero-Width Joiner" to separate the letters from the rest of the word code-wise, but not visually.
**SVG** stands for **S**‍calable **V**‍ector **G**‍raphics
SVG stands for Scalable Vector Graphics